Description: Ticking block entity

java.lang.RuntimeException: Invalid stack for slot.
at mekanism.common.inventory.slot.BasicInventorySlot.setStack(BasicInventorySlot.java:126) ~[?:?] {re:classloading}
at mekanism.common.inventory.slot.BasicInventorySlot.setStack(BasicInventorySlot.java:107) ~[?:?] {re:classloading}
at mekanism.common.tile.TileEntityFormulaicAssemblicator.moveItemsToGrid(TileEntityFormulaicAssemblicator.java:385) ~[?:?] {re:classloading}
at mekanism.common.tile.TileEntityFormulaicAssemblicator.onUpdate(TileEntityFormulaicAssemblicator.java:207) ~[?:?] {re:classloading}
at mekanism.common.tile.base.TileEntityMekanism.func_73660_a(TileEntityMekanism.java:389) ~[?:?] {re:classloading}
at net.minecraft.world.World.func_217391_K(World.java:473) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:368) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:841) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:324) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:776) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:634) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_232] {}

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Server thread
Stacktrace:
at mekanism.common.inventory.slot.BasicInventorySlot.setStack(BasicInventorySlot.java:126)
at mekanism.common.inventory.slot.BasicInventorySlot.setStack(BasicInventorySlot.java:107)
at mekanism.common.tile.TileEntityFormulaicAssemblicator.moveItemsToGrid(TileEntityFormulaicAssemblicator.java:385)
at mekanism.common.tile.TileEntityFormulaicAssemblicator.onUpdate(TileEntityFormulaicAssemblicator.java:207)
at mekanism.common.tile.base.TileEntityMekanism.func_73660_a(TileEntityMekanism.java:389)

-- Block entity being ticked --
Details:
Name: mekanism:formulaic_assemblicator // mekanism.common.tile.TileEntityFormulaicAssemblicator
Block: Block{mekanism:formulaic_assemblicator}[active=false,facing=south]
Block location: World: (528,64,-1763), Chunk: (at 0,4,13 in 33,-111; contains blocks 528,0,-1776 to 543,255,-1761), Region: (1,-4; contains chunks 32,-128 to 63,-97, blocks 512,0,-2048 to 1023,255,-1537)
Block: Block{mekanism:formulaic_assemblicator}[active=false,facing=south]
Block location: World: (528,64,-1763), Chunk: (at 0,4,13 in 33,-111; contains blocks 528,0,-1776 to 543,255,-1761), Region: (1,-4; contains chunks 32,-128 to 63,-97, blocks 512,0,-2048 to 1023,255,-1537)
Stacktrace:
at net.minecraft.world.World.func_217391_K(World.java:473)
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:368)

-- Affected level --
Details:
All players: 0 total; []
Chunk stats: ServerChunkCache: 2808
Level dimension: DimensionType{minecraft:overworld}
Level name: world
Level seed: -3794323954148762815
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options: {}
Level spawn location: World: (144,70,-90), Chunk: (at 0,4,6 in 9,-6; contains blocks 144,0,-96 to 159,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 7886545 game time, 180159 day time
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 2770 (now: true), thunder time: 119908 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:841)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:324)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:776)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:634)
at java.lang.Thread.run(Thread.java:748)

-- System Details --
Details:
Minecraft Version: 1.15.1
Minecraft Version ID: 1.15.1
Operating System: Linux (amd64) version 4.15.0-74-generic
Java Version: 1.8.0_232, Private Build
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Private Build
Memory: 199194792 bytes (189 MB) / 1604845568 bytes (1530 MB) up to 3817865216 bytes (3641 MB)
CPUs: 4
JVM Flags: 1 total; -Xmx4096M
ModLauncher: 5.0.0-milestone.4+67+b1a340b
ModLauncher launch target: fmlserver
ModLauncher naming: srg
ModLauncher services:
/eventbus-2.0.0-milestone.1-service.jar eventbus PLUGINSERVICE
/forge-1.15.1-30.0.39.jar object_holder_definalize PLUGINSERVICE
/forge-1.15.1-30.0.39.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.0.0-milestone.1-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.15.1-30.0.39.jar capability_inject_definalize PLUGINSERVICE
/forge-1.15.1-30.0.39.jar runtimedistcleaner PLUGINSERVICE
/forge-1.15.1-30.0.39.jar fml TRANSFORMATIONSERVICE
FML: 30.0
Forge: net.minecraftforge:30.0.39
FML Language Providers:
[email protected]
minecraft@1
Mod List:
forge-1.15.1-30.0.39-server.jar Minecraft {[email protected] DONE}
SereneSeasons-1.15.1-3.0.0.43-universal.jar Serene Seasons {[email protected] DONE}
mcw-bridges-1.0.3-mc1.15.1.jar Macaw's Bridges {[email protected] DONE}
elevatorid-1.15.1-1.5.4.jar Elevator Mod {[email protected] DONE}
MekanismTools-1.15.1-9.9.2.393.jar Mekanism: Tools {[email protected] DONE}
ChunkNoGoByeBye-1.15.1-1.1.0.jar ChunkNoGoByeBye {[email protected] DONE}
furniture-7.0.0-pre16-1.15.1.jar MrCrayfish's Furniture Mod {[email protected] DONE}
Morpheus-1.15.1-4.2.45.jar Morpheus {morpheus@version DONE}
MekanismGenerators-1.15.1-9.9.2.393.jar Mekanism: Generators {[email protected] DONE}
Hwyla-forge-1.10.7-B71_1.15.1.jar Waila {waila@version DONE}
jei-1.15.1-6.0.0.1.jar Just Enough Items {[email protected] DONE}
metalbarrels-2.1.jar Metal Barrels {[email protected] DONE}
magicmirror-1.0.4.1.jar Magic Mirrors {[email protected] DONE}
Mekanism-1.15.1-9.9.2.393 (1).jar Mekanism {[email protected] DONE}
forge-1.15.1-30.0.39-universal.jar Forge {[email protected] DONE}
Xaeros_Minimap_1.19.6_Forge_1.15.1.jar Xaero's Minimap {[email protected] DONE}
SuperTools-1.0b_1.15.1.jar Super Tools {[email protected] DONE}
XaerosWorldMap_1.5.4_Forge_1.15.1.jar Xaero's World Map {[email protected] DONE}
corpse-1.15.1-1.0.0.jar Corpse {[email protected] DONE}
SimpleDivingGear-4.0.0 mc 1.15.1.jar Simple Diving Gear {[email protected] mc 1.15.1 DONE}
[1.15.1] SecurityCraft v1.8.15-beta2 (1).jar SecurityCraft {[email protected] DONE}
Player Count: 0 / 10; []
Data Packs: vanilla, file/bukkit, mod:forge (incompatible), mod:cfm (incompatible), mod:chunknogobyebye, mod:corpse, mod:elevatorid, mod:jei (incompatible), mod:mcwbridges, mod:mekanism, mod:mekanismgenerators, mod:mekanismtools, mod:metalbarrels (incompatible), mod:morpheus (incompatible), mod:securitycraft (incompatible), mod:sereneseasons, mod:simpledivegear (incompatible), mod:supertools (incompatible), mod:waila (incompatible), mod:xaerominimap, mod:xaeroworldmap, mod:magicmirror (incompatible)
Is Modded: Definitely; Server brand changed to 'forge'
Type: Dedicated Server (map_server.txt)

First off please don't just delete the issue format it is there for a reason, and the format specifies also to check open issues and to paste logs in a site like gist or pastebin. But either way this is a duplicate of #5769

Sorry I just jumped on here and posted, didn't mean to ruffle anyone's feathers.